Distributions made in excess of share of earnings recognized which resulted in negative basis.

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Income (Loss) of the underlying property that is accounted under equity method of accounting.

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Investments in and contributions of capital to unconsolidated joint ventures.

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The proportionate share of Income (Loss) of the underlying equity method investment that is not recognized since the investment basis is negative and the company has no further obligation to fund additional capital to the joint venture.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments in Unconsolidated Joint Ventures - Summary of Investments and Income from Investments In Unconsolidated Joint Ventures (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Distributions of earnings from unconsolidated joint ventures			$ 3,950	$ 1,688
Contribution to the joint venture			11,750
Loss from unconsolidated joint ventures	$ (223)	$ 4,268	20,810	14,444
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Distributions made in excess of share of earnings recognized negative basis			13,368		$ 22,345
Distributions of earnings from unconsolidated joint ventures			1,053
Contribution to the joint venture			11,750
Loss from unconsolidated joint ventures	(431)	(229)	10,697	(458)
Income (Loss) of investment accounted under equity method accounting			(3,439)
Proportionate share of income (loss) of equity method investment not recognized			(1,720)
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Loss from unconsolidated joint ventures	702	713	2,171	2,059
Difference between carrying amount of investment and equity	480		480
60 Wall Street [Member]
Schedule Of Equity Method Investments [Line Items]
Loss from unconsolidated joint ventures	(18)	(10)	(52)	81
Difference between carrying amount of investment and equity	2,628		2,628
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Loss from unconsolidated joint ventures	(3,363)	223	(3,138)	1,773
Difference between carrying amount of investment and equity	970		970
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Loss from unconsolidated joint ventures	(26)	$ 33	(14)	$ (2)
Difference between carrying amount of investment and equity	$ 4,797		$ 4,797